Manually and fluid pressure operated valve



July 7, 1953 A. F. SCHWEND'NER' MANUALLY AND FLUID PRESSURE OPERATEDVALVE Filed NOV. 19, 1949 FIGB.

INVENTOR Anthony F. Schwendner aye, 5a.

' ATTORNEY WITNESSES: W. o 9 7n Cowt) Patented July 7, 1953 MANUALLY ANDFLUID PRESSURE I OPERATED vALv Anthony F. Schwendner, Ridley Park, Passignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., acorporation of Pennsyl vania Application November 19, 1949, Serial No.128,355

- 3 Claims.

The invention relates to an oil-operated throttle valve and it has foran object to provide manually operablev mechanical means for. openingthe throttle valve incident to starting, atwhich time the .oil pressureis insufiicient, and which mechemical means is' automatically"disconnected upon development of sufficient oil pressure.

.The foregoingand other objects are effected by: the invention as willbe apparent from thefollowing description and claims taken in connectionwith the accompanying drawings, forming a part of this application, inwhich:

Fig. 1 is an elevational view showing the throttle valve applied toaturbine; r a

Fig; 2 is a sectional view of the valve; and

Fig.3 is a detail viewof the releasable key for the hand wheel.

In the drawing, there is shown'a steam turbine, at M, having a steamsupply conduit H provided with throttle and governing valves l2 and 14.As is customary, the throttle valve is normally held'openby means of oilunder pressure supplied to a space from any suitable source, as by theorifice l6.

As shown, the space I5. is defined in part by the conduit l8 incommunication with the lower portion of the throttle valve operatingcylinder i9 having thepiston 28 thereinconnected to the rod 2!, carryingthe movable throttle valve element 22. The piston is normally held inupward position to hold the throttle valve open by means of oil underpressure supplied by the conduit [8, the force of such pressure actingupwardly on the piston 20 to hold the throttle valve open against theforce of the spring 24 arranged above the piston.

The conduit i8 has the usual trip valve 25 associated therewith andtripped by the emergency governor 26 to responseto over-speeding of theturbine, whereupon, due to sudden release of pressure below the piston20, the latter is moved downwardly by the spring 24 to close rapidly thethrottle valve. To enable the throttle valve to be opened when starting,at which time insufiicient pressure is supplied by the conduit l8,manual-means is provided for this purpose. Accordingly, the upper end ofthe cylinder has a cover 28 having a central threaded opening 30 inwhich there is arranged a threaded sleeve 3| coaxial with the rod 2i andthe piston 20 and a hand wheel 23 is attached to the outer end of thesleeve, the sleeve extending inwardly of the cylinder and toward thepiston 20.

The piston 20 has attached to its upper side the stem nut construction32 having a socket 33 into which extends the spindle or stem 34. A ballthrust bearing 35 is retained in the socket 33 and it is. connected tothe lower end of the spindle 34. Thus, the spindle 34 has a swivelconnection with respect to the piston 20, and the valve stem 2 I.

The outer. end of the spindle 34 has a channel 36 providing an abutmentcollar 31 having an inner abutment surface 385 The hand wheel has alatch member 39 pivoted thereto at 40 and having a notch 4| so that,with the piston 20 in its lowermost position and the sleeve screwed downby the hand wheel, the latch 39fimay be positioned to be swung, so thatthenotch 4| engages about the neck 36 withthe-upper abutment surface 42of the-latch engaged underneath the collar 38. Aspring 43 is carried bythe hand wheel and it is normally effective to swing the latch member 39about its pivot 40 to clear the upper end of the stem 34.

With" the latch member held in position back of the stem collar 31, thehand wheel. 23 may be turned outwardly until sufficient friction isdeveloped between the abutment surfaces 42 and 38 to hold the latchmember in engaged position and against the force of its spring, thelatch member being so held while the hand wheel 23 is operated to pullthe throttle valve open against the force of the spring 34.

With the emergency governor latched in position to provide fordevelopment of pressure in the pressure space. l5 and with the throttlevalve 'opened normally to the extent required and in the manner justdescribed, steam is admitted to the turbine for rotation of the latter;and, when sufficient pressure is developed in the space l5 to exertforce on the piston against the spring 2:1 to relieve the normal forcebetween the surfaces 38 and 42 the latch is released, whereupon oilunder pressure supplied by the conduit is is adequate to move the pistonto open fully the throttle valve.

While the invention has been shown in but one form, it will be obviousto those skilled in the art that it is not so limited, but issusceptible of various changes and modifications without departing fromthe spirit thereof What is claimed is:

1. A throttle valve for a turbine provided with an emergency governor, apiston operatively connected to the throttle valve; a casing structureincluding a cylinder for the piston; means for applying oil underpressure to the piston to exert opening force on the throttle valve; aspring interposed between a portion of the'casing structure and saidpiston for exerting closing force on said through said sleeve, saidspindle having a collar engageable by said latch when saidxoilpressureis less than the force of said spring, so that the latch, when inengaged position, provides, for opening the valve by rotation of thehandg'wheel when the oil pressure actingflonltheqpiston is, in-,

adequate for this purpose; and biasing means for tripping out the latchupon disengagement therefrom of said collar of- :thespindle when theforce of oil pressure acting on theapiston exceeds the force of thespring thereby providing for, closing of the throttlevalve by thespringwhen the: oil pressure is removed; I

2. A throttle valve provided with a stem for opening andclosing it; apiston-connectedto the stem," a cylinder for the piston; saidcylinderhaving abottom through'whichrthe stem extends and a cover; a springinterposed between the cover and the piston 'for' exerting valveclosingforce on the latter; 'a passage 'for' supplying liquid to thecylinderbetween the bottom and the piston for applying'to the lattervalveopening force in opposition to the valve-closing force of thespring; a sleeve having threaded connection with respect to the coverand extending into the cylinder; a hand wheel attached to the outer-endof the sleeve; a spindle having swivelled connection with respect to thestem and arranged to slidably extend through the sleeve; said-spindlehaving-an outer shoulder provided with an inner abutment faceya latchcarried by the hand wheel and having airouter -face engageablefrictionally with the shoulder inner abutment face so that, withturning-of the threaded 'sleeve and engagement ofthe latch and shoulderabutment faces to move 'the'stem in a valve opening direction againstthe force of the spring, the-spring exerts sufiicient force frictionallyengaging the abutment surfaces of the latch and of the shoulder to holdthe latch and spindle in engagement; and a spring-for moving the latchclear of the spindle upon sufiicient reduction in frictionalengagementof the latch and,

4 shoulder abutment surfaces incident to opening force of liquidpressure applied to the piston.

3. In a throttle valve device for a turbine, the combination with avalve having a stem, of a piston connected to the stem; a cylinder forthe piSt0n;,-'Said' cylinder having a bottom through which the stem-extends and a cover; a spring interposed between the cover and thepiston for exerting valve-closing force on the latter; a passageforsupplying liquid to the cylinder between thebottom and the piston forapplying to the latter valve-opening force in opposition to thevalve-closing force'of the spring; a sleeve having threaded connectionin an opening of the cover and extending into the cylinder; a hand wheelhaving an apertured hub attached to the outer end-,of-thesleeve;aspindle having swivelled connection with respect to the stem andarranged to slidably extend through the sleeve and said apertured hub;said spindle having an outer shoulder providedpwith an. inner. abutmentface; a latch, carried by .thehand wheel. and having an outer-iace;engageable frictionally; with. the shoulder. inner abutment faceso that,with. turninguof the, threadedsleeve. and, engagement of the latch and.shoulder. abutment-.;fac.es to move. the stem. in. a valve opening 1direction-against, the force of the spring, the spring exerts suiiicientforcepfrictionally engaging the abutment surfacesof the latch and of theshoulder to hold the, latch and spindle in engagement; and a spring formoving theglatch clear of the spindle upon sufiicientmeductioninfrictional engagement of the latch and shoulder abutment surfaces, incidentuto application of liquid pressure to the piston for opening thevalve, said spindle being thereafter freely movable relative tosaidapertured-hub according, to variations in pressure of oil on saidpistonand regardless; of theposition of said hand wheeli,

ANTHONY F. SCHWENDNER.

References Cited in, the ,file .of this patent UNITED STATES PATENTSNumber Name Date 430,101 Zalinski June 10, 1890 631,146 Batchelor Aug.15, 1899 1,722,754 Knauf' July 30, 1929 1,836,506 Rasmussen et a1. Dec.15, 1931 2,403,427 Ludeman July 2, 1946

